Originally Posted by
salteen
I just removed the extra shim from my 7 port. I didn't notice the temp drop but I can turn it over by hand now so I figured it was time. I also have been experiencing an intermittent low end bog that cannot be tuned out....could this have been due to the extra shim?
It could also be the glow plug. Typically as you raise compression you need to retard timing slightly to prevent detonation. You do that by going to a slightly colder plug.
After putting a turbo button in my 3 port I noticed that the head squish was .30 so I went down to .21 and went to a slightly colder plug. Where an OS P3 (ultra hot) worked before the Merlin EHD #5 (hot) works much better now.